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TPS22981RGPR датащи(PDF) 1 Page - Texas Instruments

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номер детали TPS22981RGPR
подробное описание детали  3.3V to 18V Thunderbolt Power Mux
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

TPS22981RGPR датащи(HTML) 1 Page - Texas Instruments

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background image
connector
ENHVU
S0
V3P3OUT
V3P3
V3P3
Exposed Pad
ISET_S0
ISET_S3
ISET_V3P3
VHV
VHV
DC/DC
DC/DC
µC
R
SET_S0
R
SET_S3
R
SET_V3P3
TPS22981
www.ti.com
SLVSBM6 – DECEMBER 2012
3.3V to 18V Thunderbolt Power Mux
Check for Samples: TPS22981
1
FEATURES
DESCRIPTION
Powered from 3.3V
The TPS22981 is a current-limited power mux
4.5V to 19.8V High Voltage Switch
providing a connection to a peripheral device from
either a low voltage supply (3V to 3.6V) or a high
3V to 3.6V Switch
voltage supply (4.5V to 19.8V). The desired output is
Adjustable Current Limit
selected by digital control signals.
Thermal Shutdown
The high voltage (VHV) and low voltage (V3P3)
Make Before Break Switch
switch current limits are set with external resistance.
High Voltage Discharge Before Low Voltage
Once the current limit is reached, the TPS22981 will
Make
control the switch to maintain the current at this limit.
Reverse Current Blocking
When the high voltage supply is not present, the
TPS22981 will maintain the connection to the output
APPLICATIONS
from the low voltage supply. Upon the presence of a
high voltage line and high voltage enable signal, the
Notebook Computers
high voltage switch is turned on in conjunction with
Desktop Computers
the low voltage switch until a reverse current is
Power Management Systems
detected through the low voltage switch, allowing a
seamless transition from low voltage to the high
voltage supply with minimal droop and shoot-through
current.
To prevent current backflow during a switch over from
a VHV connection to a V3P3 connection, the
TPS22981 will break the VHV connection, discharge
the output to approximately 3.3V and then make the
V3P3 connection. The output will transition to 0V
when a load is present, before returning to 3.3V.
The TPS22981 is available in a 4mm x 4mm x 1mm
QFN package.
Figure 1. Typical Application
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2012, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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